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貌似很啰嗦……

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Runnnnnnn

#1 Created at ... [Delete] [Delete and Lock User]
'use strict';
var arr = ['小明', '小红', '大军', '阿黄'];
arr.sort();
var m=arr.slice(0,3)
m=m.join(',');
var n=arr[3]
alert('欢迎'+m+'和'+n+'同学!');

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